Improvement in coal-car and truck-wheels



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i `JOHN PATTEnsoN,` or PITTSBURG, `PENNSYLVANIA.`

. Letters ,Patent No. 100,795, date-fl .March 15', 1870.

Man-

IMPROVEMENT IN COAL-CAR AND TRUCK-WHEELS. y

The Schedule referred to in these Letters Patenty and making part of the same.

To all whom 'it 'may'concern Be it known that I, JOHN PATTEnsoN, of the city of Pittsburg, in the county of Allegheny, and State `of Pennsylvania, have inventedjcertain Improvements in Coal- Oar and Truck-Wheels and in the Molding of i the same, of which the following is a specification.

The first part- Of my invention relates to the hardening of the ends of the hub in the process ot' casting, rendering the wheel Vmuch more durable, and `in the oil-box cast on and forming a part of the hub.

The second part of my invention relates tothe manner of forming the mold, coreing out the center of the hub, and chilling the ends of the same.

In the accompanying drawings- Figure l is a side view of a carwheel.

Figure 2, a `vertical central section of' the same i through the section line A B of iig. 1.

Figure, a section showing the pattern in the drag. Figure 4, a section of the ilask` before the pattern is drawn.

Figure 5, section of flask, with pattern removed and the coresin place.

Figure 6, core-box. y Figures 7 and 8, chill-rings. i G` is the wheel, which differs-in sha-pe from the ordinary car or truck-wheel only in having the oil-box D.

cast on the hub. v

This box consists in a receptacle which is iilled with cotton-waste or other like material, the filling being i saturated with oil, which is poured into the box through the pipe E. This pipe is closed vby a screw-cap.

The oil finds its way to the axle through the hole F. This hole is placed nearthe inner end `of the hub, that the oil may ilow or work out `nto the collar of the axle.

the ring N placed over it, 'lhe cope is `then put on, and filled with sand and rammed, as shown in iig. 4. The flask is then opened, and the pattern withdrawn, leaving the rings I and N imbedded in the sand. The cores which form the hole in the hub and the oil-box are then placed in their proper positions, the oi1-b'ox core being anchored by the pipe E, and the center core-O being held in a true vertical positionV by the rings I and N. Y

The projection P forms the hole from the oil-box into the hole in the hub.

The core D is made tapering at the end, that it may the morereadily enter the ring N, and be drawn into the vertical'position, as shown in fig. 5, where the ask is shown ready for pouring.

The core O is made in the metal core-box shown in iig. 6.

This core-box is drilled out perfectly true, and fitted with greatexactness, .thatthe core may be per- -fectly round. Sharp sand, prepared as usual, is used.

The-core is blackened with soap-stone and blacking, to make it smooth, andhaked to expel moisture.

The yrings I and N answer the double purpose of keeping the core O in position' and chilling the ends Aof the' hubs when the mold is poured. This chilling makes the ends of the hubs much harder and more durable.

My manner of coreing makes the hole in the huh `perfectly true and very smooth, requiring no reaming out or finishing.

Claims.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is-'- 1. The oil-box, constructed and placed as shown.

2. Coal-car and tiuckm'heels, having the ends of the hubs chilled or hardened in the process of casting, for the purpose described.

3. The combination of the rings I and N with 'thc -core for the purpose described.

JOHN PATTERSON. [L s'.]

Witnesses: .l

ANDREW HUMBERT, FRANCIS D. CLARK. 

